US20060222812A1 - Silicon carbide-containing particle, method of manufacturing a silicon carbide-based sintered object, silicon carbide-based sintered object, and filter - Google Patents
Silicon carbide-containing particle, method of manufacturing a silicon carbide-based sintered object, silicon carbide-based sintered object, and filter Download PDFInfo
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- US20060222812A1 US20060222812A1 US11/320,688 US32068805A US2006222812A1 US 20060222812 A1 US20060222812 A1 US 20060222812A1 US 32068805 A US32068805 A US 32068805A US 2006222812 A1 US2006222812 A1 US 2006222812A1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2201/62—Honeycomb-like
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2255/915—Catalyst supported on particulate filters
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- B01D2257/702—Hydrocarbons
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- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/4566—Gas separation or purification devices adapted for specific applications for use in transportation means
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
Definitions
- the present invention relates to a silicon carbide-containing particle, a method of manufacturing a silicon carbide-based sintered object, a silicon carbide-based sintered object, and a filter.
- a filter for trapping particulates contained in exhaust gas from, for example, an automobile a filter composed of a honeycomb structure of a ceramic sintered object has been employed and silicon carbide is mainly employed for the ceramic from the viewpoint of, for example, the durability of the sintered object.
- a silicon carbide-based sintered object is usually obtained by molding silicon carbide particles as raw materials into a molded object with a predetermined shape and subsequently burning the molded object.
- a method of manufacturing a ⁇ -type porous silicon carbide sintered object by mixing, into ⁇ -type polycrystalline silicon carbide with an average particle diameter of 0.1-5 ⁇ m, powder with an average diameter within a range of 0.5-100 ⁇ m and larger than the average particle diameter of the ⁇ -type polycrystalline silicon carbide, and burning the mixture at a temperature of 1700-2300° C., is disclosed in JP-A-5-139861.
- a method of manufacturing a silicon carbide-based honeycomb filter is disclosed in JP-A-9-202671, wherein a raw material composition, in which 5-65 parts by weight of ⁇ -type silicon carbide powder with an average particle diameter of 0.1-1.0 ⁇ m, a binder for molding, and a liquid dispersion medium are compounded and mixed into 100 parts by weight of ⁇ -type silicon carbide powder with an average particle diameter of 0.3-50 ⁇ m, is molded into a honeycomb filter shape with the thickness of a cell wall being 0.05-1.0 mm by an extrusion molding method and, subsequently, the ⁇ -type silicon carbide powder is re-crystallized by burning in non-oxidative atmosphere.
- JP-A-2000-16872 which is composed of a sequence of the following first process through third process:
- the first process a process for uniformly mixing 10-70 parts by weight of ⁇ -type or ⁇ -type silicon carbide powder with an average particle diameter of 0.1-1 ⁇ m into 100 parts be weight of ⁇ -type silicon carbide powder with an average particle diameter of 5-100 ⁇ m;
- the second process a process of molding a mixture obtained from the aforementioned first process.
- the third process a process of burning a molded object obtained from the aforementioned second process at a temperature within a range of 1700-2300° C.
- an oxide-based catalyst-supporting layer such as alumina or titania is frequently set on the surface of a filter for trapping particulates (referred to as a “honeycomb filter” below) which is composed of a silicon carbide-based sintered object in order to enhance a reactivity with gas particles.
- JP-A-5-139861, JP-A-9-202671, and JP-A-2000-16872 are hereby incorporated by reference.
- a silicon carbide-containing particle that contains silicon carbide wherein the silicon carbide contains at least one of silicon carbide with polymorph 6H and silicon carbide with polymorph 15R and the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R in the silicon carbide is approximately 70% or more by weight.
- the total content is preferably approximately 70% or more by weight and approximately 95% or less by weight.
- the silicon carbide-containing particle is preferably obtained by mixing particles that contain silicon carbide with a first average particle diameter and particles that contain silicon carbide with a second average particle diameter different from the first average particle diameter.
- a method of manufacturing a silicon carbide-based sintered object obtained by sintering an object containing a silicon carbide-containing particle that contains silicon carbide which uses a silicon-carbide containing particle according to the first aspect of the present invention as the silicon-carbide containing particle.
- the method of manufacturing a silicon carbide-based sintered object preferably includes a step of oxidizing at least one portion of a surface of the silicon carbide-based sintered object.
- a silicon carbide-based sintered object obtained by sintering an object containing a silicon carbide-containing particle that contains silicon carbide is provided, wherein the silicon carbide-containing particle is a silicon-carbide containing particle according to the first aspect of the present invention.
- the silicon carbide-based sintered object preferably has an oxidized layer on a surface thereof.
- the silicon carbide-based sintered object preferably includes a honeycomb structure.
- a filter capable of trapping a particulate which includes the silicon carbide-based sintered object according to the third aspect of the present invention.
- FIG. 1 is a perspective view that schematically shows a specific example of an assembly-type honeycomb filter.
- FIG. 2A is a perspective view that schematically shows a porous ceramic part constituting the honeycomb filter shown in FIG. 1 .
- FIG. 2B is a cross-sectional view of the porous ceramic part along line A-A shown in FIG. 2A .
- FIG. 3A is a perspective view that schematically shows a specific example of an integrated-type honeycomb filter.
- FIG. 3B is a cross-sectional view of the integrated-type honeycomb filter along line B-B shown in FIG. 3A .
- FIG. 4 is a diagram showing the relation between the total content of silicon carbide with polymorph 6H and silicon carbide with polymorph 15R in silicon carbide and the flexural strength and pore size of a silicon carbide-based sintered object.
- the first embodiment of the present invention is a silicon carbide-containing particle that contains silicon carbide, wherein the silicon carbide contains at least one of silicon carbide with polymorph 6H and silicon carbide with polymorph 15R and the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R in the silicon carbide is approximately 70% or more by weight.
- Silicon carbide is broadly classified into ⁇ -type silicon carbide being a hexagonal system and ⁇ -type silicon carbide being a cubic system. It is known that many kinds of “polymorphs” exist in the ⁇ -type silicon carbide, whereas only one kind of “polymorph” (3C) exists in the ⁇ -type silicon carbide.
- a “polymorph” refers to a crystal structure of silicon carbide dependent on the difference in repeated stack along the c-axis of a base plane of a hexagonal crystal lattice. As representative polymorphs, 2H, 4H, 6H, and 15R are provided (in Ramsdell representation).
- the number represents the repeated unit number of stack(s) of a closest-packed plane (a base plane in the hexagonal system and a (111) plane in the cubic system), and H, C, and R represent a hexagonal crystal, a cubic crystal, and a rhombohedral crystal, respectively.
- polymorph 2H has a repeated unit of AB while polymorph 4H has a basic repeated unit of ABAC.
- the abundance ratios of these polymorphs can be calculated from data obtained, for example, by means of NMR, Raman scattering spectroscopy or by means of X-ray diffraction of silicon carbide powder.
- the sintering property of silicon carbide-containing particles and the characteristics of an obtained silicon carbide-based sintered object can be improved by controlling the abundance ratios of polymorphs in the silicon carbide-containing particles. That is, as the crystal structures of silicon carbides are different from one another, the sintering reaction properties of silicon carbide-containing particles are also different from one another. Therefore, the sintering reaction of silicon carbide-containing particles can be facilitated by increasing the abundance ratio of a polymorph with a good sintering reaction property.
- the more the repeated unit number of the stacks in a polymorph is, the more the phase stability of silicon carbide at high temperature is generally improved. Therefore, it is preferable that the abundance ratio of a polymorph with a high repeated number of the stacks be high in order to improve the phase stability of silicon carbide-containing particles.
- the silicon carbide-containing particles are sintered, thermal energy can be suppressed, which energy is consumed when silicon carbide with a polymorph in which the repeated number of the stacks is low is subjected to the phase transition to silicon carbide with a polymorph in which the repeated number of the stacks is high (for example, polymorph 3C to polymorph 6H). Consequently, thermal energy can be effectively used for the sintering reaction.
- a silicon carbide-containing particle can be provided which can be sintered more effectively, since the silicon carbide contains at least one of silicon carbide with polymorph 6H and silicon carbide with polymorph 15R and the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R in the silicon carbide is approximately 70% or more by weight.
- the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R is difficult to be subjected to phase transition at high temperature and easy to be sintered. Therefore, thermal energy consumed for the phase transition of silicon carbide can be suppressed in the silicon carbide-containing particles in which the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R in the silicon carbide is approximately 70% or more by weight, so that the sintering reaction of the silicon carbide-containing particles can be effectively promoted. Consequently, the silicon carbide-containing particles in accordance with the first embodiment are excellent in the sintering property at high temperature.
- the strength of a silicon carbide-based sintered object is enhanced and the pore size of the silicon carbide-based sintered object increases.
- polymorphs 3C and 4H have comparatively good sintering property (sintering reaction is easy to occur) among polymorphs of silicon carbide.
- the polymorphs 6H and 15R are polymorphs that exhibit stable phases at high temperature, the more the silicon carbides with polymorphs 6H and 15R are, the more effectively thermal energy is consumed for the sintering reaction of silicon carbide-containing particles. Therefore, it is basically preferable that the abundance ratios of the silicon carbides with polymorphs 6H and 15R be high, in order to facilitate the sintering reaction of silicon carbide-containing particles.
- the total content is preferably approximately 70% or more by weight and approximately 95% or less by weight. That is, it is preferable that the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R be approximately 95% or less by weight.
- silicon carbide-based sintered object it is considered that other polymorphs 3C and 4H of silicon carbide be subjected to phase transition to polymorphs with high repeated numbers of the stacks at the time of the sintering reaction of silicon carbide-containing particles so as to serve to relax stress stored in a silicon carbide-based sintered object. It is preferable that the total content of silicon carbide with polymorph 3C and silicon carbide with polymorph 4H in silicon carbide be approximately 5% or more by weight in order to relax the stress stored in the silicon carbide-based sintered object.
- the total content of the silicon carbide with polymorph 3C and the silicon carbide with polymorph 4H becomes relatively lower so that thermal energy is not effectively utilized for the sintering reaction of silicon carbide-containing particles.
- the sintering property of silicon carbide-containing particles can be improved by adjusting the abundance ratios of silicon carbides with polymorph 3C, 4H, 6H, and 15R in the silicon carbide-containing particles.
- silicon carbide obtained by a normal method of producing silicon carbide (Atchison method) using the reduction reaction of SiO 2 with coke silicon carbide with a polymorph of which the repeated number of the stacks is higher than those of silicon carbides with polymorph 2H and 15R is hardly contained.
- the control of the abundance ratio of a polymorph in silicon carbide-containing particles can be realized as follows.
- silicon dioxide is reduced with coke in an electric furnace according to the Atchison method to produce silicon carbide as a raw material.
- the temperature of a reaction field of the reduction reaction varies with the distances from both electrodes provided in the electric furnace and obtained silicon carbides as raw materials undergo thermal histories different from one another. Therefore, silicon carbides with the abundance ratios of polymorphs that differ from one another dependent on the location in the electric furnace are obtained as raw materials.
- each compartment is pulverized so as to obtain silicon carbide-containing particles with the abundance ratios of polymorphs different from one another. Further, silicon carbide-containing particles with more kinds of abundance ratios of polymorphs can be obtained by mixing silicon carbide-containing particles obtained from the compartments different from one another.
- silicon carbide-containing particles in accordance with the first embodiment of the present invention preferably are obtained by mixing particles that contain silicon carbide with a first average particle diameter and particles that contain silicon carbide with a second average particle diameter different from the first average particle diameter.
- the silicon carbide-containing particles obtained as mentioned above are sized so as to sample silicon carbide-containing particles with an average particle diameter of approximately 10 ⁇ m and silicon carbide-containing particles with an average particle diameter of approximately 0.5 ⁇ m and these silicon carbide-containing particles are mixed at a ratio of approximately 70: approximately 30 (weight ratio).
- the second embodiment of the present invention is a method of manufacturing a silicon carbide-based sintered object obtained by sintering an object containing a silicon carbide-containing particle that contains silicon carbide, wherein a silicon-carbide containing particle in accordance with the first embodiment of the present invention as the silicon-carbide containing particle is used.
- the method of manufacturing a silicon carbide-based sintered object according to the second embodiment of the present invention includes, for example, a raw materials-mixing process for mixing or kneading silicon carbide-containing particles in accordance with the first embodiment of the present invention with a necessary organic binder so as to obtain paste that contains the silicon carbide-containing particles, a molding process for molding the paste obtained in the raw materials-mixing process into a predetermined shape, and a sintering process for sintering a molded object obtained in the molding process.
- silicon carbide-containing particles in accordance with the first embodiment of the present invention for example, silicon carbide-containing particles with the abundance ratios of polymorphs of silicon carbide different from one another, which are obtained by the aforementioned method, can be used. Also, the mixture of two kinds of silicon carbide-containing particles with average particle diameters different from one another (referred to as “coarse silicon carbide-containing particles” and “fine silicon carbide-containing particles”, respectively, below) can be utilized. Herein, the abundance ratios of polymorphs in the coarse silicon carbide-containing particles and fine silicon carbide-containing particles are equivalent.
- Paste that contains silicon carbide-containing particles can be prepared by adding, for example, an organic binder and a liquid dispersion medium, into a mixture of two kinds of silicon carbide-containing particles with average particle diameter different from one another.
- an organic binder for example, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, a phenol resin, an epoxy resin can be used.
- an organic solvent such as benzene and an alcohol such as methanol, water can be used.
- the paste obtained in the raw materials-mixing process is molded into a predetermined shape (for example, a honeycomb shape).
- a predetermined shape for example, a honeycomb shape.
- molding methods such as extrusion molding, casting, and pressing can be provided.
- an obtained molded object is dried.
- drying means a microwave dryer and a hot air dryer can be used. The drying is carried out at a temperature in a range of approximately 100-approximately 200 ° C.
- the molded object obtained in the molding process is sintered in a non-oxidative atmosphere.
- degreasing treatment for the molded object may be performed at a temperature of approximately 300-approximately 1000° C. in a non-oxidative atmosphere before sintering the molded object, dependent on the kind of organic binder.
- the degreasing treatment for the molded object is performed before sintering the molded object so that the residue of the organic binder can be prevented from participating in the sintering reaction of the silicon carbide-containing particles and adversely affecting the characteristics of a silicon carbide-based sintered object at the time of sintering of the molded object.
- contamination in a sintering furnace by a volatile component generated at the time of sintering of the molded object can be prevented.
- non-oxidative atmosphere for example, nitrogen, argon, helium, hydrogen, or the mixture thereof is used.
- the temperature at which the molded object is sintered depends on a time period of the treatment but is preferably approximately 1800-approximately 2200° C. For example, if the time period of the treatment is approximately 3 hours, the sintering may not sufficiently proceed at a temperature of approximately 1700° C. or less. Additionally, although the sintering can be performed at temperature higher than approximately 2200° C., at such a high temperature, even if conventional silicon carbide-containing particles are used, the sintering proceeds for a comparatively short time period and, therefore, the benefit obtained by the method of manufacturing a silicon carbide-based sintered object according to the second embodiment of the present invention relatively decreases.
- silicon carbide-containing particles can be sintered more effectively and a silicon carbide-based sintered object can be manufactured more effectively since the silicon carbide-containing particles in accordance with the first embodiment of the present invention are used. Therefore, the cost for manufacturing a-silicon carbide-based sintered object is reduced. Also, when a silicon carbide-based sintered object is manufactured, there is a low possibility of generating the non-uniformity of sintering and the failure of sintering and the yield for the manufacture of a product of the silicon carbide-based sintered object is improved.
- a step of oxidizing at least one portion of a surface of the silicon carbide-based sintered object is included.
- an oxidation process for oxidizing at least one portion of a surface of the silicon carbide-based sintered object may be carried out.
- the oxidation treatment for a surface of the silicon carbide-based sintered object is carried out in oxygen-containing atmosphere such as air atmosphere.
- the oxidation treatment may be carried out on any condition, dependent on the condition on which the silicon carbide-based sintered object is used. For example, a uniform oxidized layer of approximately 0.5-approximately 1 nm is formed on the surface of the silicon carbide-based sintered object by means of the oxidation treatment at approximately 900° C. for approximately 1 minute.
- the thermal shock resistance of a silicon carbide-based sintered object can be improved by an oxidized layer formed by such an oxidation treatment, when the silicon carbide-based sintered object is regenerated.
- a silicon carbide-based sintered object with a good thermal shock resistance can be obtained.
- the adhesion property of a surface coat layer such as a catalyst-supporting layer can be improved, which layer is provided on a surface of the silicon carbide-based sintered object according to need in the latter process and contains another oxide such as alumina and titania.
- a silicon carbide-based sintered object on which separation of a surface coat layer such as a catalyst-supporting layer is difficult to occur can be obtained.
- the oxidation resistance of a silicon carbide-based sintered object and the properties (such as thickness and uniformity) of an oxidized layer formed on a surface of the silicon carbide-based sintered object vary with the abundance ratios of polymorphs in silicon carbide-containing particles.
- the oxidation resistances of polymorphs 6H and 15R be better among polymorphs of silicon carbide.
- a silicon carbide-based sintered object obtained by using silicon carbide-containing particles that contain a high proportion of these polymorphs 6H and 15R is held in oxygen-containing atmosphere, a thin and uniform oxidized layer is rapidly formed on a surface of the silicon carbide-based sintered object. Therefore, it is considered that this oxidized layer serves to bond the silicon carbide-based sintered object and an oxide coat layer and the adhesion property of the oxide coat layer to the silicon carbide-based sintered object is improved.
- the third embodiment of the present invention is a silicon carbide-based sintered object obtained by sintering an object containing a silicon carbide-containing particle that contains silicon carbide, wherein the silicon carbide-containing particle is a silicon-carbide containing particle in accordance with the first embodiment of the present invention.
- the silicon carbide-based sintered object according to the third embodiment of the present invention can be manufactured by the method of manufacturing a silicon carbide-based sintered object in accordance with the second embodiment of the present invention.
- the silicon carbide-based sintered object according to the third embodiment of the present invention has an oxidized layer on a surface thereof.
- the oxidized layer on a surface of the silicon carbide-based sintered object can be formed by oxidizing at least one portion of a surface of the silicon carbide-based sintered object.
- the silicon carbide-based sintered object according to the third embodiment of the present invention has a honeycomb structure.
- the shape and number of cells that constitute the honeycomb structure may be any shape and number, respectively.
- the cells that constitute the honeycomb structure have a pillar shape and the cross-section shape of the cell is a polygon such as, approximately, a square, rectangle, or triangle, or alternatively, the cross-section shape of a circle or ellipse.
- the fourth embodiment of the present invention is a filter capable of trapping a particulate, which includes the silicon carbide-based sintered object in accordance with the third embodiment of the present invention.
- the filter capable of trapping a particulate according to the fourth embodiment of the present invention may be, for example, an automotive exhaust gas-purifying filter that is used for trapping particulates in exhaust gas exhausted from an internal combustion engine of an automobile.
- a silicon carbide-containing particle which can be sintered more efficiently a method of manufacturing a silicon carbide-based sintered object using the silicon carbide-containing particle, a silicon carbide-based sintered object that can be obtained by using the silicon carbide-containing particle, and a filter that includes the silicon carbide-based sintered object can be provided, respectively.
- FIG. 1 is a perspective view that schematically shows a specific example of an assembly-type honeycomb filter.
- FIG. 2A is a perspective view that schematically shows a porous ceramic part constituting the honeycomb filter shown in FIG. 1 and
- FIG. 2B is a cross-sectional view of the porous ceramic part along line A-A shown in FIG. 2A .
- a honeycomb filter 10 is composed of a cylindrical ceramic block 15 and plural porous ceramic parts 20 are bundled using a seal material layer 14 in the block.
- a seal material layer 13 is provided around the ceramic block 15 , as necessary or desired, in order to prevent the leak of exhaust gas or to adjust the shape of the ceramic block 15 .
- the porous ceramic parts 20 constituting the cylindrical ceramic block 15 have a square-pillar shape herein. Also, a large number of through-holes 21 that extend along the longitudinal directions of the porous ceramic parts 20 are arranged in parallel through the intermediary of a partition 23 and one end of the through-hole 21 is sealed with a sealing material 22 . Therefore, exhaust gas flowing into one through-hole 21 passes through a partition 23 that separates the through-holes 21 and, subsequently, flows out from another through-hole 21 and the partition 23 that separates these through-holes 21 can function as a filter for trapping particulates.
- FIG. 3A is a perspective view that schematically shows a specific example of an integrated-type honeycomb filter and FIG. 3B is a cross-sectional view of the integrated-type honeycomb filter along line B-B shown in FIG. 3A .
- a honeycomb filter 30 is composed of a cylindrical ceramic block 35 and the block is composed of a porous ceramic in which a large number of through-holes 31 that extend along the longitudinal directions of the honeycomb filter 30 are arranged in parallel through the intermediary of a partition 33 .
- one end of the through-hole 31 provided to the ceramic block 35 of the honeycomb filter 30 is sealed with a sealing material 32 and the other end of the through-hole 31 is not sealed with the sealing material 32 . Therefore, exhaust gas flowing into one through-hole 31 passes through a partition 33 that separates the through-holes 31 and, subsequently, flows out from another through-hole 31 and the partition 33 that separates these through-holes 31 can function as a filter for trapping particulates.
- a seal material layer may be provided around the ceramic block 35 similar to the honeycomb filter 10 shown in FIG. 1 , which is not shown in FIGS. 3A and 3B .
- the silicon carbide-based sintered object according to the third embodiment of the present invention can be used, for example, for a heater, a jig for semiconductor fabrication, a thermal insulation material, a heat exchanger, a catalyst carrier, a hot-temperature gas-purifying filter, a molten metal-filtering filter, as well as the filter capable of trapping particulates such as an automotive exhaust gas-purifying filter.
- a silicon carbide-based sintered object was manufactured using 12 kinds of silicon carbide-containing particles in which the abundance ratios of polymorphs 3C, 4H, 6H, and 15R in silicon carbide are adjusted, in accordance with the aforementioned processes (examples 1-9 and comparisons 1-3).
- samples of the silicon carbide-based sintered objects were honeycomb-shaped silicon carbide-based sintered objects in which a number of cells extending along the longitudinal directions of the silicon carbide-based sintered object were arranged in parallel through the intermediary of cell walls with a thickness of 0.1-0.2 mm (referred to as “honeycomb filters” below).
- honeycomb filters a number of cells extending along the longitudinal directions of the silicon carbide-based sintered object were arranged in parallel through the intermediary of cell walls with a thickness of 0.1-0.2 mm.
- the shape of the cross section of each cell orthogonal to the longitudinal directions of the cells was a square.
- the dimensions of the honeycomb filters were 34.3 mm ⁇ 34.3 mm ⁇ 150 mm (which filters are referred to as “honeycomb filters A” below).
- Temperature for sintering the silicon carbide-containing particles was 2200° C. and a time period for sintering the silicon carbide-containing particles was 3 hours.
- Rigaku RINT-2500 produced by Rigaku Denki was used as an X-ray diffraction apparatus for analyzing polymorphs of silicon carbide in the silicon carbide-containing particles.
- a light source of the X-ray diffraction apparatus was CuK ⁇ 1.
- the sample was pulverized and homogenized, and packed into a sample holder made of glass. Then, the sample holder in which the sample was packed was set on a sample stage of a goniometer. Next, cooling water was flown through an X-ray lamp and a power supply of the X-ray diffraction apparatus was turned on. The voltage of the power supply was gradually raised to be 30 kV, and the current was set to 15 mA by rotating a current selector. Afterward, the measurement conditions of the X-ray diffraction were set as
- Monochromatic photo-receiving slit 0.8 mm
- Optical system concentric optical system and the measurement of the X-ray diffraction was performed.
- the pore sizes of the honeycomb filters A were measured by cutting the honeycomb filters A into cubes with sides of 0.8 cm and using an Automated Porosimeter (Autopore III9405 produced by Shimadzu Corporation). Then, the pore size was the average pore size of a cube of the honeycomb filter A. Also, the three-point flexure tests for the honeycomb filters A were performed using an apparatus (5582) produced by Instron Corporation.
- the obtained results are shown in FIG. 4 .
- the pore sizes of the honeycomb filters A (examples 1-9) manufactured by silicon carbide-containing particles in which the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R was 70% or more by weight were approximately 10 ⁇ m and the honeycomb filters A had large pore sizes. Also, the flexural strengths of these honeycomb filters A were greater than 400 kg and the honeycomb filters A had good strengths.
- the large pore size of the sintered object means that the sintering reaction between the silicon carbide-containing particles proceeded more sufficiently even for sintering treatments at the same temperature and time period. Therefore, it is clear that the honeycomb filters A manufactured by using silicon carbide-containing particles in which the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R was 70% or more by weight, that is, the honeycomb filters A of examples 1-9, had excellent sintering properties compared to the honeycomb filters A of comparisons 1-3.
- the pore sizes of the honeycomb filters A of examples 1-9 were in a range of 10 ⁇ m ⁇ 0.5 ⁇ m and these pore sizes almost coincided with a pore size of a particulate-trapping filter loaded on a normal Diesel car. Therefore, whereas the sintering of the silicon carbide-containing particles used in comparisons 1-3 was insufficient for sintering treatment at 2200° C. for 3 hours, the silicon carbide-based sintered objects with a preferable pore size were obtained by means of the same sintering treatment with respect to the silicon carbide-containing particles used in examples 1-9.
- the silicon carbide-containing particles were used in which the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R was 95% or less by weight, the decreases of the strengths of the silicon carbide-based sintered objects were low.
- honeycomb filters A that remained on the conditions after the sintering
- honeycomb filters B to which a pre-oxidation treatments at 900° C. for 1 minute were applied after the sintering
- honeycomb filters C in which catalyst supporting layers were applied on honeycomb side walls of the honeycomb filters A and honeycomb filters D in which catalyst supporting layers were applied on honeycomb side walls of the honeycomb filters B were used.
- alumina slurry with an average particle diameter of 2 nm was prepared by mixing ⁇ -alumina and water in an aqueous solution of nitric acid as a dispersing agent and applying mill treatment to the obtained mixture for 24 hours by ball mill.
- the slurry was impregnated into the honeycomb filters A and dried at 200° C. and, subsequently, kept at 600° C. so as to be fixed on surfaces of the honeycomb filters A.
- the honeycomb filters A were dipped in a solution of dinitroammineplatinum nitrate, dried at 110° C., and kept at 500° C. in nitrogen atmosphere, so that platinum was fixed on a surface of the honeycomb filters A.
- the PM regeneration test is a test such that a particle material (PM) is made to adhere to a honeycomb filter and, subsequently, this filter is kept at high temperature for burning the PM, so as to evaluate the change of the state of the honeycomb filter between before and after the burning of the PM.
- the collection of the PM was performed so that the amount of the PM per a unit volume of each honeycomb filter was 10 g/L, so as to evaluate the state of each honeycomb filter after the regeneration test.
- the existence or nonexistence of a crack on surfaces of the honeycomb filters A and B was observed and the existence or nonexistence of separation of the catalyst supporting layers on the honeycomb filters C and D was evaluated. Those results are shown in Table 2.
- the silicon carbide-containing particles in which the total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R is 70% or more by weight exhibited good sintering property. Also, the thermal shock resistance of the obtained silicon carbide-based sintered object was improved and the adhesion property of the surface coat layer to the silicon carbide-based sintered object was improved by applying the pre-oxidation treatment to the silicon carbide-based sintered object.
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JP2005099054 | 2005-03-30 | ||
PCT/JP2005/016936 WO2006112052A1 (fr) | 2005-03-30 | 2005-09-14 | Particule contenant du carbure de silicium, procédé de production d'un matériau fritté au carbure de silicium, matériau fritté au carbure de silicium et filtre |
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CN (1) | CN101146742B (fr) |
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Also Published As
Publication number | Publication date |
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CN101146742B (zh) | 2013-05-01 |
KR20070112396A (ko) | 2007-11-23 |
CN101146742A (zh) | 2008-03-19 |
DE602005025973D1 (de) | 2011-03-03 |
JPWO2006112052A1 (ja) | 2008-11-27 |
EP1707544A1 (fr) | 2006-10-04 |
WO2006112052A1 (fr) | 2006-10-26 |
ATE496016T1 (de) | 2011-02-15 |
EP1707544B1 (fr) | 2011-01-19 |
KR100911641B1 (ko) | 2009-08-12 |
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